US10497573B2 - Selective atomic layer etching of semiconductor materials - Google Patents
Selective atomic layer etching of semiconductor materials Download PDFInfo
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- US10497573B2 US10497573B2 US15/920,146 US201815920146A US10497573B2 US 10497573 B2 US10497573 B2 US 10497573B2 US 201815920146 A US201815920146 A US 201815920146A US 10497573 B2 US10497573 B2 US 10497573B2
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/12—Gaseous compositions
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- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32357—Generation remote from the workpiece, e.g. down-stream
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- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32422—Arrangement for selecting ions or species in the plasma
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- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0337—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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Definitions
- the present technology relates to semiconductor processes and equipment. More specifically, the present technology relates to methods and systems for isotropic atomic or molecular layer etching of materials used in semiconductor processing.
- Integrated circuits are made possible by processes which produce intricately patterned material layers on substrate surfaces. Producing patterned material on a substrate requires controlled methods for removal of exposed material. Chemical etching is used for a variety of purposes including transferring a pattern in photoresist into underlying layers, thinning layers, or thinning lateral dimensions of features already present on the surface. Often it is desirable to have an etch process that etches one material faster than another facilitating, for example, a pattern transfer process. Such an etch process is said to be selective to the first material. As a result of the diversity of materials, circuits, and processes, etch processes have been developed with a selectivity towards a variety of materials.
- Etch processes may be termed wet or dry based on the materials used in the process.
- a wet HF etch preferentially removes silicon oxide over other dielectrics and materials.
- wet processes may have difficulty penetrating some constrained trenches and also may sometimes deform the remaining material.
- Dry etches produced in local plasmas formed within the substrate processing region can penetrate more constrained trenches and exhibit less deformation of delicate remaining structures.
- local plasmas may damage the substrate through the production of electric arcs as they discharge.
- Exemplary etching methods may include flowing a halogen-containing precursor into a processing region of a semiconductor processing chamber.
- the methods may further include contacting an exposed region of a semiconductor material with the halogen-containing precursor such that the halogen-containing precursor may be adsorbed on a surface of the exposed region of the semiconductor material.
- the methods may also include forming a film of the halogen-containing precursor having a predetermined thickness on the surface of the exposed region of the semiconductor material.
- the methods may further include pausing the flow of the halogen-containing precursor into the processing region of the semiconductor processing chamber.
- the methods may also include etching the exposed region of the semiconductor material with the adsorbed halogen-containing precursor.
- the adsorbed halogen-containing precursor may produce a fluoride of the semiconductor material.
- the method may further include purging the halogen-containing precursor not adsorbed on the surface of the exposed region of the semiconductor material.
- the film of the halogen-containing precursor formed on the surface of the exposed region of the semiconductor material may include an atomic layer of the halogen-containing precursor.
- etching the exposed region of the semiconductor material may include isotropically etching the exposed region of the semiconductor material.
- the adsorbed halogen-containing precursor may produce a noble gas.
- the halogen-containing precursor may include at least one of a noble gas compound precursor, an interhalogen precursor, or a fluorinating precursor.
- the semiconductor material may include at least one of silicon, germanium, or a compound thereof.
- a temperature of the substrate may be maintained at about room temperature.
- the etching method may be repeated for at least two cycles.
- a thickness of the semiconductor material etched during each cycle may be between about 5 ⁇ and about 50 ⁇ .
- the etching method may have a selectivity toward the semiconductor material to a metal-containing material greater than or about 50:1.
- the metal-containing material may include at least one of titanium, titanium nitride, tantalum, tantalum nitride, tungsten, or titanium tungsten.
- a pressure within the semiconductor processing chamber may be maintained between about 5 mTorr and about 50 Torr.
- the present technology may also include additional exemplary etching methods.
- the methods may include flowing a halogen-containing precursor into a processing region of a semiconductor processing chamber.
- the methods may further include contacting an exposed region of a metal-containing material with the halogen-containing precursor such that the halogen-containing precursor may be adsorbed on a surface of the exposed region of the metal-containing material.
- the methods may further include forming a film of the halogen-containing precursor on the surface of the exposed region of the metal-containing material.
- the methods may also include pausing the flow of the halogen-containing precursor into the processing region of the semiconductor processing chamber.
- the methods may further include etching the exposed region of the metal-containing material with the adsorbed halogen-containing precursor.
- the adsorbed halogen-containing precursor may produce a fluoride of the metal-containing material.
- the methods may further include purging the halogen-containing precursor not adsorbed on the surface of the exposed region of the metal-containing material such that an atomic layer of the halogen-containing precursor may be produced on the surface of the exposed region of the metal-containing material.
- a temperature of the substrate may be maintained between about room temperature and about 300° C.
- the metal-containing material may include at least one of molybdenum, titanium, titanium nitride, tantalum, tantalum nitride, tungsten, or titanium tungsten.
- the halogen-containing precursor may include XeF 2 .
- the methods may further include contacting an exposed region of a semiconductor material with the halogen-containing precursor such that the halogen-containing precursor may be adsorbed on a surface of the exposed region of the semiconductor material.
- the methods may further include forming a film of the halogen-containing precursor on the surface of the exposed region of the semiconductor material.
- the methods may also include pausing the flow of the halogen-containing precursor into the processing region of the semiconductor processing chamber.
- the methods may further include etching the exposed region of the semiconductor material with the adsorbed halogen-containing precursor on the surface of the exposed region of the semiconductor material.
- the adsorbed halogen-containing precursor may produce a fluoride of the semiconductor material.
- the present technology may also include additional exemplary etching methods.
- the methods may include flowing a first halogen-containing precursor into a processing region of a semiconductor processing chamber.
- the first halogen-containing precursor may include a noble gas compound precursor.
- the methods may further include contacting an exposed region of a semiconductor material with the first halogen-containing precursor such that the first halogen-containing precursor may be adsorbed on a surface of the exposed region of the semiconductor material.
- the methods may further include etching the exposed region of the semiconductor material with the adsorbed first halogen-containing precursor.
- the adsorbed first halogen-containing precursor may produce a gaseous byproduct.
- the methods may also include forming a second halogen-containing precursor from the gaseous byproduct using plasma.
- the methods may further include flowing the second halogen-containing precursor into the processing region of the semiconductor processing chamber.
- the methods may also include contacting the exposed region of the semiconductor material with the second halogen-containing precursor such that the second halogen-containing precursor may be adsorbed on the surface of the exposed region of the semiconductor material.
- the methods may further include etching the exposed region of the semiconductor material with the adsorbed second halogen-containing precursor.
- the adsorbed second halogen-containing precursor may produce a fluoride of the semiconductor material.
- the gaseous byproduct may include at least one of a noble gas or a halogen gas.
- the technology may allow for highly selective etching towards semiconductor materials over a wide variety of metals, oxides, nitrides, carbides, and/or organic compounds commonly used in semiconductor processing.
- the technology may also allow for highly selective etching of select metal-containing materials at elevated temperatures.
- the high selectivity offered by the technology may further allow very thin mask materials to be used.
- the technology may allow for very controlled delivery of precursors and may achieve atomic or molecular layer etching of select semiconductor and metal-containing materials to improve the uniformity of the etched profile.
- the technology may allow for isotropic etching of semiconductor materials from all crystal planes.
- the technology may be more economical by collecting and reusing select etch byproducts.
- FIG. 1 shows a top plan view of one embodiment of an exemplary processing system according to embodiments of the present technology.
- FIG. 2A shows a schematic cross-sectional view of an exemplary processing chamber according to embodiments of the present technology.
- FIG. 2B shows a detailed view of a portion of the processing chamber illustrated in FIG. 2A according to embodiments of the present technology.
- FIG. 3 shows a bottom plan view of an exemplary showerhead according to embodiments of the present technology.
- FIG. 4 shows exemplary operations in a method according to embodiments of the present technology.
- FIGS. 5A-5D show cross-sectional views of substrates being processed according to embodiments of the present technology.
- FIG. 6 shows a schematic view of an exemplary precursor delivery system according to embodiments of the present technology.
- FIG. 7 shows exemplary operations in a method according to embodiments of the present technology.
- FIG. 8 shows exemplary operations in a method according to embodiments of the present technology.
- the selectivity of conventional wet chemistry etching processes for etching silicon relative to other materials is generally low.
- the wet chemistry etching processes can also be crystallographic, which means that etching of silicon may not be the same at different cyrstal planes. For example, etching of silicon at silicon crystal planes of (110), (111) or along the ⁇ 110>, ⁇ 111> direction may be so slow that the etching process may be substantially stopped at these crystal planes or surfaces, which results in roughness in the etched profile.
- Low selectivity toward silicon and crystallographic etching are also common problems many dry etching processes encounter.
- the present technology overcomes these issues by utilizing one or more halogen-containing persursors that may be highly selective towards silicon over a wide variety of metals, oxides, nitrides, carbides, and/or organic compounds commonly used in semiconductor processing.
- the halogen-containing precursors may also allow for isotropic etching of semiconductor materials from all crystal planes.
- the technology further overcomes the issues associated with the conventional etching processes by controlling the delivery of the precursors to achieve atomic or molecular layer etching and to obtain uniformity in the etched profile.
- the present technology may be plasma free, which may limit damage to the substrate features many conventional dry etching methods may cause.
- FIG. 1 shows a top plan view of one embodiment of a processing system 100 of deposition, etching, baking, and curing chambers according to embodiments.
- a pair of front opening unified pods (FOUPs) 102 supply substrates of a variety of sizes that are received by robotic arms 104 and placed into a low pressure holding area 106 before being placed into one of the substrate processing chambers 108 a - f , positioned in tandem sections 109 a - c .
- a second robotic arm 110 may be used to transport the substrate wafers from the holding area 106 to the substrate processing chambers 108 a - f and back.
- Each substrate processing chamber 108 a - f can be outfitted to perform a number of substrate processing operations including the dry etch processes described herein in addition to cyclical layer deposition (CLD), atomic layer deposition (ALD), chemical vapor deposition (CVD), physical vapor deposition (PVD), etch, pre-clean, degas, orientation, and other substrate processes.
- CLD cyclical layer deposition
- ALD atomic layer deposition
- CVD chemical vapor deposition
- PVD physical vapor deposition
- etch pre-clean, degas, orientation, and other substrate processes.
- the substrate processing chambers 108 a - f may include one or more system components for depositing, annealing, curing and/or etching a dielectric or metallic film on the substrate wafer.
- two pairs of the processing chambers e.g., 108 c - d and 108 e - f
- the third pair of processing chambers e.g., 108 a - b
- all three pairs of chambers e.g., 108 a - f , may be configured to etch a dielectric or metallic film on the substrate.
- any one or more of the processes described may be carried out in chamber(s) separated from the fabrication system shown in different embodiments. It will be appreciated that additional configurations of deposition, etching, annealing, and curing chambers for dielectric films are contemplated by system 100 .
- FIG. 2A shows a cross-sectional view of an exemplary process chamber system 200 with partitioned plasma generation regions within the processing chamber.
- film etching e.g., titanium nitride, tantalum nitride, tungsten, copper, cobalt, silicon, polysilicon, silicon oxide, silicon nitride, silicon oxynitride, silicon oxycarbide, etc.
- a process gas may be flowed into the first plasma region 215 through a gas inlet assembly 205 .
- a remote plasma system (RPS) 201 may optionally be included in the system, and may process a first gas which then travels through gas inlet assembly 205 .
- the inlet assembly 205 may include two or more distinct gas supply channels where the second channel (not shown) may bypass the RPS 201 , if included.
- a cooling plate 203 , faceplate 217 , ion suppressor 223 , showerhead 225 , and a substrate support 265 , having a substrate 255 disposed thereon, are shown and may each be included according to embodiments.
- the pedestal 265 may have a heat exchange channel through which a heat exchange fluid flows to control the temperature of the substrate, which may be operated to heat and/or cool the substrate or wafer during processing operations.
- the wafer support platter of the pedestal 265 which may comprise aluminum, ceramic, or a combination thereof, may also be resistively heated in order to achieve relatively high temperatures, such as from up to or about 100° C. to above or about 600° C., using an embedded resistive heater element.
- the faceplate 217 may be pyramidal, conical, or of another similar structure with a narrow top portion expanding to a wide bottom portion.
- the faceplate 217 may additionally be flat as shown and include a plurality of through-channels used to distribute process gases.
- Plasma generating gases and/or plasma excited species, depending on use of the RPS 201 may pass through a plurality of holes, shown in FIG. 2B , in faceplate 217 for a more uniform delivery into the first plasma region 215 .
- Exemplary configurations may include having the gas inlet assembly 205 open into a gas supply region 258 partitioned from the first plasma region 215 by faceplate 217 so that the gases/species flow through the holes in the faceplate 217 into the first plasma region 215 .
- Structural and operational features may be selected to prevent significant backflow of plasma from the first plasma region 215 back into the supply region 258 , gas inlet assembly 205 , and fluid supply system 210 .
- the faceplate 217 , or a conductive top portion of the chamber, and showerhead 225 are shown with an insulating ring 220 located between the features, which allows an AC potential to be applied to the faceplate 217 relative to showerhead 225 and/or ion suppressor 223 .
- the insulating ring 220 may be positioned between the faceplate 217 and the showerhead 225 and/or ion suppressor 223 enabling a capacitively coupled plasma (CCP) to be formed in the first plasma region.
- a baffle (not shown) may additionally be located in the first plasma region 215 , or otherwise coupled with gas inlet assembly 205 , to affect the flow of fluid into the region through gas inlet assembly 205 .
- the ion suppressor 223 may comprise a plate or other geometry that defines a plurality of apertures throughout the structure that are configured to suppress the migration of ionically-charged species out of the first plasma region 215 while allowing uncharged neutral or radical species to pass through the ion suppressor 223 into an activated gas delivery region between the suppressor and the showerhead.
- the ion suppressor 223 may comprise a perforated plate with a variety of aperture configurations. These uncharged species may include highly reactive species that are transported with less reactive carrier gas through the apertures. As noted above, the migration of ionic species through the holes may be reduced, and in some instances completely suppressed.
- Controlling the amount of ionic species passing through the ion suppressor 223 may advantageously provide increased control over the gas mixture brought into contact with the underlying wafer substrate, which in turn may increase control of the deposition and/or etch characteristics of the gas mixture.
- adjustments in the ion concentration of the gas mixture can significantly alter its etch selectivity, e.g., SiNx:SiOx etch ratios, Si:SiOx etch ratios, etc.
- it can also shift the balance of conformal-to-flowable style depositions for dielectric materials.
- the plurality of apertures in the ion suppressor 223 may be configured to control the passage of the activated gas, i.e., the ionic, radical, and/or neutral species, through the ion suppressor 223 .
- the aspect ratio of the holes, or the hole diameter to length, and/or the geometry of the holes may be controlled so that the flow of ionically-charged species in the activated gas passing through the ion suppressor 223 is reduced.
- the holes in the ion suppressor 223 may include a tapered portion that faces the plasma excitation region 215 , and a cylindrical portion that faces the showerhead 225 .
- the cylindrical portion may be shaped and dimensioned to control the flow of ionic species passing to the showerhead 225 .
- An adjustable electrical bias may also be applied to the ion suppressor 223 as an additional means to control the flow of ionic species through the suppressor.
- the ion suppressor 223 may function to reduce or eliminate the amount of ionically charged species traveling from the plasma generation region to the substrate. Uncharged neutral and radical species may still pass through the openings in the ion suppressor to react with the substrate. It should be noted that the complete elimination of ionically charged species in the reaction region surrounding the substrate may not be performed in embodiments. In certain instances, ionic species are intended to reach the substrate in order to perform the etch and/or deposition process. In these instances, the ion suppressor may help to control the concentration of ionic species in the reaction region at a level that assists the process.
- showerhead 225 in combination with ion suppressor 223 may allow a plasma present in first plasma region 215 to avoid directly exciting gases in substrate processing region 233 , while still allowing excited species to travel from chamber plasma region 215 into substrate processing region 233 .
- the chamber may be configured to prevent the plasma from contacting a substrate 255 being etched. This may advantageously protect a variety of intricate structures and films patterned on the substrate, which may be damaged, dislocated, or otherwise warped if directly contacted by a generated plasma.
- the rate at which oxide species etch may increase. Accordingly, if an exposed region of material is oxide, this material may be further protected by maintaining the plasma remotely from the substrate.
- the processing system may further include a power supply 240 electrically coupled with the processing chamber to provide electric power to the faceplate 217 , ion suppressor 223 , showerhead 225 , and/or pedestal 265 to generate a plasma in the first plasma region 215 or processing region 233 .
- the power supply may be configured to deliver an adjustable amount of power to the chamber depending on the process performed. Such a configuration may allow for a tunable plasma to be used in the processes being performed. Unlike a remote plasma unit, which is often presented with on or off functionality, a tunable plasma may be configured to deliver a specific amount of power to the plasma region 215 . This in turn may allow development of particular plasma characteristics such that precursors may be dissociated in specific ways to enhance the etching profiles produced by these precursors.
- a plasma may be ignited either in chamber plasma region 215 above showerhead 225 or substrate processing region 233 below showerhead 225 .
- Plasma may be present in chamber plasma region 215 to produce the radical precursors from an inflow of, for example, a fluorine-containing precursor or other precursor.
- An AC voltage typically in the radio frequency (RF) range may be applied between the conductive top portion of the processing chamber, such as faceplate 217 , and showerhead 225 and/or ion suppressor 223 to ignite a plasma in chamber plasma region 215 during deposition.
- An RF power supply may generate a high RF frequency of 13.56 MHz but may also generate other frequencies alone or in combination with the 13.56 MHz frequency.
- FIG. 2B shows a detailed view 253 of the features affecting the processing gas distribution through faceplate 217 .
- faceplate 217 , cooling plate 203 , and gas inlet assembly 205 intersect to define a gas supply region 258 into which process gases may be delivered from gas inlet 205 .
- the gases may fill the gas supply region 258 and flow to first plasma region 215 through apertures 259 in faceplate 217 .
- the apertures 259 may be configured to direct flow in a substantially unidirectional manner such that process gases may flow into processing region 233 , but may be partially or fully prevented from backflow into the gas supply region 258 after traversing the faceplate 217 .
- the gas distribution assemblies such as showerhead 225 for use in the processing chamber section 200 may be referred to as dual channel showerheads (DCSH) and are additionally detailed in the embodiments described in FIG. 3 .
- the dual channel showerhead may provide for etching processes that allow for separation of etchants outside of the processing region 233 to provide limited interaction with chamber components and each other prior to being delivered into the processing region.
- the showerhead 225 may comprise an upper plate 214 and a lower plate 216 .
- the plates may be coupled with one another to define a volume 218 between the plates.
- the coupling of the plates may be so as to provide first fluid channels 219 through the upper and lower plates, and second fluid channels 221 through the lower plate 216 .
- the formed channels may be configured to provide fluid access from the volume 218 through the lower plate 216 via second fluid channels 221 alone, and the first fluid channels 219 may be fluidly isolated from the volume 218 between the plates and the second fluid channels 221 .
- the volume 218 may be fluidly accessible through a side of the gas distribution assembly 225 .
- FIG. 3 is a bottom view of a showerhead 325 for use with a processing chamber according to embodiments.
- showerhead 325 may correspond with the showerhead 225 shown in FIG. 2A .
- Through-holes 365 which show a view of first fluid channels 219 , may have a plurality of shapes and configurations in order to control and affect the flow of precursors through the showerhead 225 .
- Small holes 375 which show a view of second fluid channels 221 , may be distributed substantially evenly over the surface of the showerhead, even amongst the through-holes 365 , and may help to provide more even mixing of the precursors as they exit the showerhead than other configurations.
- a substrate Prior to the first operation of the method, a substrate may be processed in one or more ways before being placed within a processing region of a chamber in which method 400 may be performed. For example, films or layers may be deposited, grown, or otherwise formed on the substrates, and masks for patterning the films or layers may be formed to produce features. Vias, trenches, and/or lateral recesses may be formed or defined within the substrate.
- the vias or trenches may have an aspect ratio, or a ratio of their height to width, greater than or about 2, greater than or about 5, greater than or about 10, greater than or about 20, greater than or about 30, greater than or about 50, or more in embodiments.
- the lateral recesses may have an aspect ratio, or a ratio of their depth extending laterally to their height expanding vertically, greater than or about 2, greater than or about 5, greater than or about 10, greater than or about 20, greater than or about 30, greater than or about 50, or more in embodiments.
- a liner material may be formed along the trench or recess sidewalls to protect the substrate from metal diffusion.
- FIG. 5A illustrates a portion of a processed structure 500 a .
- the processed structure 500 a may be produced during a multi-patterning process.
- the processed structure 500 a may be further developed in producing, for example, FinFET structures, or any other semiconductor structures.
- the processed structure 500 a may include layered materials and features overlaying a substrate 505 .
- the processed structure may include a patterned structure 510 sandwiched between adjacent hard mask spacers 515 . Although only one patterned structure 510 and two adjacent hard spacers 515 are shown in FIG.
- the processed structure 500 a may include more than one patterned structure 510 each of which may be sandwiched between two hard mask spacers 515 .
- the patterned structure 510 may include a semiconductor material, such as silicon, germanium, silicon germanium, or may include a metal or metal-containing material, such as molybdenum.
- the hard mask spacer 515 may include a nitride, such as silicon nitride, a carbide, such as silicon carbide, an oxide, such as a thermal oxide or low temperature oxide which may include silicon oxide or other oxide that may be used or useful in semiconductor processes.
- the patterned structure 510 may further include one or more layered materials above which the patterned structure 510 and the hard mask spacer 515 may be formed.
- the processed structure 500 a may include a first layer 520 above which the patterned structure 510 and the hard mask spacer 515 may be formed.
- the first layer 520 may include another hard mask material, which may be the same as or different from the material of the hard mask spacers 515 .
- the first layer 520 may include a nitride, such as silicon nitride, a carbide, such as silicon carbide, an oxide, such as a thermal oxide or low temperature oxide which may include silicon oxide or other oxide, and so on.
- the processed structure 500 a may further include a second layer 525 below the first layer 520 and above the substrate 505 .
- the second layer 525 may include another semiconductor material, which may be the same as or different from the material of the patterned structure 510 .
- the second layer 525 may include silicon, germanium, silicon germanium, or molybdenum.
- the first layer 520 may be formed by performing an oxidation process on the second layer 525 . Accordingly, the first layer 520 may include an oxide layer of the material of the second layer 525 .
- the second layer 525 may include silicon, and the first layer 520 may include silicon oxide.
- the processed structure 500 a may include only one or more than two layers between the patterned structure 510 and the substrate 505 .
- the processed structure 500 a may be produced in the same processing chamber as the processing chamber in which method 400 may be performed, or may be produced in a different processing chamber and then transferred to the processing chamber in which method 400 may be performed.
- the substrate 505 may be positioned within a processing region of a semiconductor processing chamber, such as the substrate processing region 233 of the processing chamber 200 discussed above with reference to FIG. 2A
- method 400 may be initiated by flowing a halogen-containing precursor into the processing region at operation 405 .
- Method 400 may further include, at operation 410 , contacting exposed regions of the processed structure 500 a , which may include exposed regions of the semiconductor materials forming the patterned structure 510 and exposed regions of nitride, carbide, or oxide forming the hard mask spacers 515 and the first layer 520 , with the halogen-containing precursor. During this operation, the halogen-containing precursor may be adsorbed at the surfaces of the exposed regions of the processed structure 500 a . Method 400 may further include forming a film of the halogen-containing precursor at the exposed regions of the processed structure 500 a at operation 415 .
- the thickness of the halogen-containing precursor film formed at the exposed surfaces of the processed structure 500 a may be controlled such that a predetermined thickness, including an atomic layer, a molecular layer, a few atomic layers, or a few molecular layers in some embodiments, of the halogen-containing precursor film may be obtained, which in turn may lead to controlled etching, such as atomic layer etching or molecular layer etching, of the exposed regions of the processed structure 500 a.
- the halogen-containing precursor may include a variety of fluids, and may include one or more of noble gas compound precursors, interhalogen precursors, fluorinating precursors, or other halogen-containing precursors that may be used or useful in semiconductor processes.
- the noble gas compound precursors may include one or more noble gas halides, which may include xenon halides, such as xenon fluoride, krypton halides, such as krypton fluoride, or any other compounds including a noble gas element and a halogen that may be used or useful in semiconductor processes.
- One exemplary noble gas compound precursor may include xenon difluoride (XeF 2 ).
- Xenon difluoride may include a vapor pressure of about 4 Torr at about 25° C.
- the halogen-containing precursor film formed on the exposed surfaces of the processed structure 500 a may be formed to a predetermined thickness, and in some embodiments, the film formed may include an atomic layer, a molecular layer, a few atomic layers, or a few molecular layers of the halogen-containing precursor.
- xenon difluoride vapor or gas may be formed in a loading chamber before being flowed into the processing region of the processing chamber where the processed structure 500 a may be positioned.
- the pressure of the loading chamber may be maintained at about 4 Torr, and the temperature of the loading chamber may be maintained at about 25° C.
- the pressure and/or temperature of the loading chamber may be maintained at other suitable ranges, although the pressure may be maintained within a relatively low range to facilitate controlled flow of the xenon difluoride vapor or gas into the processing chamber where the processed structure 500 a may be positioned, and the temperature may be maintained to be similar to the temperature at which method 400 may be performed.
- the pressure of the loading chamber may be maintained below or about 20 Torr in embodiments.
- the pressure of the loading chamber may be maintained below or about 15 Torr, and may be maintained below or about 10 Torr, below or about 5 Torr, below or about 4 Torr, below or about 3 Torr, below or about 2 Torr, below or about 1 Torr, below or about 500 mTorr, below or about 100 mTorr, below or about 50 mTorr, below or about 20 mTorr, below or about 10 mTorr, below or about 5 mTorr, below or about 4 mTorr, below or about 3 mTorr, below or about 2 mTorr, below or about 1 mTorr, or lower.
- the pressure may be maintained between about 500 mTorr and about 10 Torr. In embodiments the pressure may be maintained below about 500 mTorr.
- the temperature of the loading chamber may be maintained between about 0° C. and about 50° C. in embodiments. The temperature may be maintained above or about 5° C., and may be maintained above or about 10° C., above or about 15° C., above or about 20° C., above or about 25° C., above or about 30° C., above or about 35° C., above or about 40° C., above or about 45° C., above or about 50° C., or higher.
- the pressure of the loading chamber may be maintained at an increased level, and/or the temperature of the loading chamber may be maintained at a decreased level such that xenon difluoride may be preserved in the loading chamber in a solid form.
- the xenon difluoride vapor or gas may then be flowed into the processing region of the processing chamber where the processed structure 500 a may be positioned via a gas distribution assembly of the processing chamber, such as the gas distribution assembly 205 of the processing chamber 200 described above with reference to FIG. 2 at operation 405 .
- the xenon difluoride gas may also be flowed through one or more faceplates and/or showerheads, such as the faceplate 217 and the showerhead 225 described above with reference to FIG. 2 , to facilitate even distribution of the precursor onto the processed structure 500 a .
- the xenon difluoride gas may then contact the exposed regions of the processed structure 500 a , and may form a film on the exposed surfaces of the processed structure 500 a at operation 415 .
- a loading chamber is described herein as an example for delivery of xenon difluoride, xenon difluoride, as well as other halogen-containing precursors, may be generated in situ in some embodiments of the technology, as will be described in more detail below.
- the interhalogen precursors may include one or more compounds containing two or more halogen elements, such as one or more fluorides containing fluorine and one or more of chlorine, bromine, or iodine, one or more chlorides containing chlorine and one or more of fluorine, bromine, or iodine, one or more bromides containing bromine and one or more of fluorine, chlorine, or iodine, or other interhalogen precursors that may be used or useful in semiconductor processes.
- halogen elements such as one or more fluorides containing fluorine and one or more of chlorine, bromine, or iodine, one or more chlorides containing chlorine and one or more of fluorine, bromine, or iodine, one or more bromides containing bromine and one or more of fluorine, chlorine, or iodine, or other interhalogen precursors that may be used or useful in semiconductor processes.
- interhalogen precursors may include iodine fluoride, such as iodine monofluoride, iodine trifluoride, iodine pentafluoride, iodine heptafluoride, and may further include chlorine fluoride, such as chlorine monofluoride, chlorine trifluoride, chlorine pentafluoride, and so on.
- iodine fluoride such as iodine monofluoride, iodine trifluoride, iodine pentafluoride, iodine heptafluoride
- chlorine fluoride such as chlorine monofluoride, chlorine trifluoride, chlorine pentafluoride, and so on.
- interhalogen compounds may be more reactive and thus serve better halogenating agents because the interhalogen bonds may be weaker as compared to diatomic halogen bonds, except for F 2 .
- the highly reactive interhalogen compounds may be used as halogen-containing precursors for selective
- the element of the interhalogen having a relatively higher electronegativity such as fluorine
- the element of the interhalogen having a relatively lower electronegativity may be recycled to re-form one or more halogen-containing precursors using a plasma process, as will be described in more detail below.
- the fluorinating precursors may include any of the noble gas compound precursors or the interhalogen precursors described above, or other fluorinating precursors that may be used or useful in selective etching of semiconductor or other materials used in semiconductor processes and device manufacturing.
- the amount or dosage of xenon difluoride or other halogen-containing precursors delivered to the processing region of the processing chamber where the processed structure 500 a may be positioned may be controlled.
- the amount or dosage of the xenon difluoride gas or other halogen-containing precursors that may be flowed into the processing region may be predetermined or calculated based on desired film thickness, the flow rate at which xenon difluoride or other halogen-containing precursors may be flowed, the amount of time during which xenon difluoride or other halogen-containing precursors may be flowed, the pressure of the processing region, the temperature of the processing region and/or the processed structure 500 a , the particular structures and features of the processed structure 500 a , and so on.
- an exemplary precursor delivery system 600 may include a loading chamber 602 , such as the loading chamber discussed above for forming vaporized xenon difluoride precursor.
- the loading chamber 602 may also be configured to contain any other halogen-containing precursors described herein.
- the loading chamber 602 may include or may employ a bubbler for facilitating delivery of xenon difluoride or other halogen-containing precursors.
- a precision valve 606 may be coupled to an outlet line of the loading chamber 602 .
- the precision valve 606 may include one or more atomic layer deposition valves.
- the atomic layer deposition valves may include high-speed pneumatic valves.
- the high-speed pneumatic valves may be opened for a period of time that may be less than or about a few seconds in embodiments, and may be opened for less than or about 1 second, less than or about 0.5 seconds, less than or about 0.1 seconds, less than or about 50 milliseconds, less than or about 40 milliseconds, less than or about 30 milliseconds, less than or about 20 milliseconds, less than or about 10 milliseconds, less than or about 5 milliseconds, less than or about 4 milliseconds, less than or about 3 milliseconds, less than or about 2 milliseconds, less than or about 1 millisecond, or less.
- the halogen-containing precursors before being flowed into the processing chamber 604 , may be mixed or combined with one or more carrier gases.
- the halogen-containing precursors may be flowed into a carrier gas line 608 .
- the carrier gases may be flowed and may carry the halogen-containing precursors to the processing chamber 604 .
- the flow of the carrier gases may be controlled through one or more mass-flow controllers 612 .
- the flow rate and/or amount of the halogen-containing precursors flowed into the processing chamber 604 may be controlled in a variety of ways.
- the precision valve 606 may be opened for a predetermined period of time to control the halogen-containing precursors flowed into the carrier gas line 608 .
- the precision valve 606 may be opened for a period of time less than or about 1 second, less than or about 0.5 seconds, less than or about 0.1 seconds, less than or about 50 milliseconds, less than or about 40 milliseconds, less than or about 30 milliseconds, less than or about 20 milliseconds, less than or about 10 milliseconds, less than or about 5 milliseconds, less than or about 4 milliseconds, less than or about 3 milliseconds, less than or about 2 milliseconds, less than or about 1 millisecond, or less, depending on the specific application or process may require.
- the flow rate and/or amount of the halogen-containing precursors flowed into the processing chamber 604 may also be controlled by adjusting the flow of the carrier gases to obtain a desired dilution factor.
- a ratio of the flow rate of the carrier gases to the flow rate of the halogen-containing precursors before combining may be greater than or about 5:1, greater than or about 10:1, greater than or about 20:1, greater than or about 50:1, greater than or about 100:1, greater than or about 200:1, greater than or about 300:1, greater than or about 400:1, greater than or about 500:1, or more.
- the precision valve 606 may be opened and/or the dilution of the halogen-containing precursors by the carrier gases, the amount or dosage of the halogen-containing precursors delivered to the processing chamber 604 may be controlled to obtain desired etching rates.
- the flow rate of xenon difluoride or other halogen-containing precursors may be less than or about 50 sccm in embodiments, and may be less than or about 45 sccm, less than or about 40 sccm, less than or about 35 sccm, less than or about 30 sccm, less than or about 25 sccm, less than or about 20 sccm, less than or about 15 sccm, less than or about 10 sccm, less than or about 5 sccm, less than or about 3 sccm, less than or about 1 sccm, or less.
- the flow rate of the xenon difluoride gas or other halogen-containing precursors may be maintained at a relatively low level to facilitate dosage control as well as to improve the uniformity of the thickness of the film formed at the exposed surfaces of the processed structure 500 a.
- the flow or delivery of xenon difluoride or other halogen-containing precursors may be pulsed for time periods of less than or about 30 seconds in embodiments, and may be pulsed for time periods of less than or about 25 seconds, less than or about 20 seconds, less than or about 15 seconds, less than or about 10 seconds, less than or about 5 seconds, less than or about 2 seconds, or less.
- the flow or delivery of xenon difluoride or other halogen-containing precursors may be paused for less than or about 30 seconds in embodiments, and may be paused for time periods of less than or about 25 seconds, less than or about 20 seconds, less than or about 15 seconds, less than or about 10 seconds, less than or about 5 seconds, less than or about 2 seconds, or less.
- the flow rate and pulsing may be combined for any of the listed numbers.
- the flow rate of xenon difluoride or other halogen-containing precursors may be below or about 10 sccm and may be delivered in pulses from about 5 to about 10 seconds in embodiments, depending on the desired thickness of the film formed.
- the pressure of the processing region may be maintained below or about 50 Torr in embodiments.
- the pressure may be maintained below or about 40 Torr, and may be maintained below or about 30 Torr, below or about 20 Torr, below or about 15 Torr, below or about 10 Torr, below or about 5 Torr, below or about 4 Torr, below or about 3 Torr, below or about 2 Torr, below or about 1 Torr, below or about 800 mTorr, below or about 600 mTorr, below or about 400 mTorr, below or about 200 mTorr, below or about 100 mTorr, below or about 80 mTorr, below or about 60 mTorr, below or about 40 mTorr, below or about 20 mTorr, below or about 10 mTorr, below or about 5 mTorr, below or about 2 mTorr, below or about 1 mTorr, or lower.
- Maintaining a relatively low pressure inside the processing chamber may facilitate even adsorption and uniform film formation by the halogen-containing precursors at the surfaces of the processed structure 500 a , and in some embodiments, to facilitate atomic or molecular layer adsorption of xenon difluoride or other halogen-containing precursors at the exposed surfaces.
- the temperature of the processing region or at the substrate level may be maintained between about 0° C. and about 100° C. in embodiments.
- the temperature may be maintained above or about 5° C., and may be maintained above or about 10° C., above or about 15° C., above or about 20° C., above or about 25° C., above or about 30° C., above or about 35° C., above or about 40° C., above or about 45° C., above or about 50° C., above or about 60° C., above or about 70° C., above or about 80° C., above or about 90° C., or higher.
- the temperature of the processing region or at the substrate level may be maintained at about room temperature or the chamber temperature without additional heating or cooling performed at the substrate level.
- the room temperature may range between about 10° C. and about 50° C.
- a film of the halogen-containing precursors with a desired thickness, including atomic-layer thickness, and uniformity may be formed at the exposed regions of the processed structure 500 a .
- controlled film formation of the halogen-containing precursors at the exposed regions of the processed structure 500 a may further lead to controlled etching, including atomic or molecular layer etching in some embodiments, of the exposed regions of the processed structure 500 a .
- method 400 may also include pausing the flow of the halogen-containing precursors at operation 420 by halting the flow of the halogen-containing precursors, and may further include purging the halogen-containing precursors that may not be adsorbed on the exposed surfaces of the processed structure 500 a at operation 425 using one or more inert gases.
- the purging operation 425 may be performed immediately after the predetermined amount of the halogen-containing precursors may be flowed.
- the purging operation 425 may be performed after the flow of the halogen-containing precursors may be paused for a period of time so as to allow the halogen-containing precursors to flow onto and to be adsorbed on the exposed surfaces of the processed structure 500 a .
- the purging operation 425 may be performed after the flow of the halogen-containing precursors may be paused for a time period of less than or about 30 seconds in embodiments, and may be paused for time periods of less than or about 25 seconds, less than or about 20 seconds, less than or about 15 seconds, less than or about 10 seconds, less than or about 5 seconds, less than or about 2 seconds, or less.
- Method 400 may then proceed to operation 430 to etch the exposed regions of the processed structure 500 a with the adsorbed halogen-containing precursors. Because the thickness of the halogen-containing precursor film may be predetermined, or in other words, the amount of the halogen-containing precursors available for the etching operation 430 may be predetermined, the thickness or amount of the materials etched may be controlled at operation 430 .
- atomic or molecular layer etching of select materials may be achieved in operation 430 .
- a thickness of less than or about 5 nm of select materials at the exposed regions of the processed structure 500 a may be etched or removed.
- the removal may be at least about 5 ⁇ , and may be between about 5 ⁇ and about 5 nm of removal, or between about 10 ⁇ and about 2 nm of removal.
- method 400 may be repeated for several cycles to achieve a greater overall removal thickness.
- method 400 may be repeated for at least two cycles, and may be repeated for at least about 3 cycles, at least about 5 cycles, at least about 8 cycles, at least about 10 cycles, at least about 20 cycles, at least about 50 cycles, at least about 100 cycles, or more.
- the number of cycles may be dependent on the amount of removal provided by each cycle.
- the halogen-containing precursors may interact with the patterned structure 510 , which may include one or more semiconductor materials, such as silicon, germanium, silicon germanium, or may include a metal or metal-containing, such as molybdenum.
- the halogen-containing precursors may include one or more of a nitride, a carbide, or an oxide, such as silicon nitride, silicon carbide, or silicon oxide.
- the halogen-containing precursors may have a selectivity toward the semiconductor material forming the patterned structure 510 to the nitride, carbide, or oxide material forming the hard mask spacers 515 or the first layer 520 greater than or about 100:1, greater than or about 200:1, greater than or about 300:1, greater than or about 400:1, or higher depending on the operating conditions.
- the interaction between the adsorbed halogen-containing precursors with the exposed semiconductor material of the patterned structure 510 may produce one or more volatile substances, which may then be removed from the processing chamber.
- the volatile byproducts produced by the interaction between the halogen-containing precursors and the semiconductor material may include a halide of the semiconductor material, such as a fluoride of the semiconductor material, which may include silicon fluoride, such as silicon tetrafluoride, germanium fluoride, such as germanium tetrafluoride, molybdenum fluoride, such as molybdenum hexafluoride, or any fluorinated compound or molecule of the etched material.
- the volatile byproducts produced may further include a noble gas or a halogen, depending on the halogen-containing precursors flowed.
- a noble gas halide such as xenon difluoride
- xenon gas may be released and may be removed from the chamber.
- an interhalogen such as chlorine fluoride
- chlorine gas may be released and may be removed from the chamber.
- the noble gas or halogen released may be captured and recycled to produce additional halogen-containing precursors.
- the processed structure 500 a may further include exposed regions of one or more metal-containing materials.
- the metal-containing materials may include titanium, tantalum, tungsten, or one or more compounds thereof, such as titanium nitride, tantalum nitride, titanium tungsten, and so on.
- the halogen-containing precursors substantially may not interact with or may interact only to a limited extent with these metal-containing materials at about room temperature, although the halogen-containing precursors may interact and thus etch these metal-containing materials at elevated temperatures as will be discussed in more detail below.
- the halogen-containing precursors may have a selectivity towards the semiconductor material forming the patterned structure 510 over titanium, titanium nitride, tantalum, tantalum nitride, tungsten, or titanium tungsten of greater than or about 50:1, greater than or about 100:1, greater than or about 150:1, greater than or about 200:1, or higher depending on the operating conditions.
- the processed structure 500 a may further include exposed regions of other metal-containing materials that the halogen-containing precursors substantially may not interact with or may only react to a limited extent at room or elevated temperatures.
- metal-containing materials may include gold, copper, aluminum, nickel, chrome, platinum, gallium, hafnium, and so on.
- the halogen-containing precursors, such as xenon difluoride may not interact with aluminum, nickel, chrome, platinum, gallium, hafnium or the interaction with these metals may be so limited that the selectivity toward the semiconductor material forming the patterned structure 510 to these metals may be close to infinite.
- halogen-containing precursors may not interact with may further include aluminum nitride, gallium arsenide, select oxides, such as PZT, magnesium oxide, zinc oxide, hafnium oxide, titanium oxide, aluminum oxide, zirconium dioxide, and so on.
- the halogen-containing precursors may not interact with polymers or select organic compounds commonly used in semiconductor processing, such as photoresists, PDMS (polydimethylsiloxane), C 4 F 8 , silica glass, dicing tape, PP (polypropylene), PEN (polyethylene naphthalate), PET (polyethylene terephthalate), ETFE (ethylene tetrafluoroethylene), acrylic, and so on.
- the processed structure 500 a as shown in FIG. 5A may be developed into the processed structure 500 b shown in FIG. 5B .
- the processed structure 500 b may be further processed into the processed structure 500 c shown in FIG. 5C , with only the portions of the first layer 520 below the hard mask spacers 515 remaining, the hard mask spacers 515 and the portions of the first layer 520 not covered by the hard mask spacers 515 being removed.
- the processed structure 500 c may be produced using deposition of mask layers combined with dry etching processes, which may be performed in the same processing chamber as method 400 .
- the first layer 520 may include a nitride, such as silicon nitride, a carbide, such as silicon carbide, an oxide, such as a thermal oxide or low temperature oxide which may include silicon oxide or other oxide, and so on
- the second layer 525 may include a semiconductor material, such as silicon, germanium, silicon germanium, or may include a metal or metal-containing material, such as molybdenum.
- the halogen-containing precursors may have a high selectivity towards semiconductor materials, such as those included in the second layer 525 over the nitride, carbide, or oxide which may be included in the first layer 520 . Therefore, when one or more halogen-containing precursors may be flowed into the processing region, the second layer 525 may be etched or removed by the halogen-containing precursors while the remaining portions of the first layer 520 may not be removed, and the processed structure 500 d of FIG. 5D may be produced.
- the processed structure 500 d may be produced by performing method 400 for one or more cycles, with each cycle removing a predetermined thickness of the second layer 525 material, and in some embodiments, with each cycle removing only one or a few atomic or molecular layers of the second layer 525 material.
- method 400 may be used for selective etching of semiconductor materials, such as silicon, germanium, silicon germanium, or may be used for selective etching of metal or metal-containing materials, such as molybdenum, using very thin mask materials.
- semiconductor materials such as silicon, germanium, silicon germanium
- metal or metal-containing materials such as molybdenum
- FIGS. 5A and 5B selective etching of the semiconductor material forming the patterned structure 510 may be achieved using very narrow masks or spacers, such as the hard mask spacers 515 , which may be only a few nanometers or less.
- FIGS. 5A and 5B selective etching of the semiconductor material forming the patterned structure 510 may be achieved using very narrow masks or spacers, such as the hard mask spacers 515 , which may be only a few nanometers or less.
- selective etching of the semiconductor material forming the second layer 525 may also be achieved using very thin masks, such as the first layer 520 , which may be only a few nanometers, a few angstroms, or less. Additionally, by controlling the thickness of the halogen-containing precursors adsorbed on exposed regions of materials to be etched and by performing method 400 in cycles, atomic or molecular layer etching in each cycle may be achieved, and the uniformity of the etched profile may also be improved. Moreover, as can be understood from the description above, method 400 may be plasma free, which may avoid damage to the processed structure caused by plasma many conventional dry etching methods utilize.
- Another advantage associated with method 400 may include isotropic etching of semiconductor materials, such as silicon, germanium, silicon germanium, or metal or metal-containing materials, such as molybdenum.
- semiconductor materials such as silicon, germanium, silicon germanium, or metal or metal-containing materials, such as molybdenum.
- silicon as an example, many etchants used in both wet and dry etching processes may only etch silicon at or from select crystal planes but not the others. For example, many etchants may not etch or may substantially stop etching when contacted with (110), (111), etc., crystal planes of silicon.
- the features may not be etched if the exposed surfaces correspond to one of the above mentioned crystal planes of silicon.
- the etched profile may not be uniform because depending on the orientation of the crystals, some may be etched while others may not be etched.
- the halogen-containing precursors used in the present technology may etch the above mentioned semiconductor materials from any crystal planes or towards any crystal directions. Therefore, whether the substrate features may be formed of single- or polysilicon, the exposed surfaces may be etched uniformly. Further, because the halogen-containing precursors may etch the semiconductor materials from any crystal planes or towards any crystal directions, method 400 may be utilized in lateral recessing of semiconductor features, such as lateral recessing operations which may be performed in producing V-NAND memory cells.
- method 700 may be implemented for etching of select metal-containing materials, which may include titanium, tantalum, tungsten, or one or more compounds thereof, such as titanium nitride, tantalum nitride, titanium tungsten, and so on.
- Method 700 may include operations similar to operations of method 400 to achieve finely controlled delivery of etching precursors and to achieve thin layer etching, including atomic or molecular layer etching, of select materials.
- Method 700 may include, at operation 705 , flowing a halogen-containing precursor into a processing region of a processing chamber where a processed structure may be positioned.
- the halogen-containing precursors utilized for method 400 may also be utilized for method 700 .
- the halogen-containing precursors flowed at operation 705 may include one or more of noble gas compound precursors, interhalogen precursors, fluorinating precursors, or other halogen-containing precursors.
- the noble gas compound precursors may include one or more noble gas halides, which may include xenon halides, such as xenon fluoride, krypton halides, such as krypton fluoride, or any other compounds including a noble gas element and a halogen that may be used or useful in semiconductor processes. Similar to method 400 , method 700 may utilize xenon difluoride as one of the halogen-containing precursors, which may be vaporized first in a loading chamber, and then flowed to the processing region of the processing chamber where the processed structure to be etched may be positioned.
- noble gas halides which may include xenon halides, such as xenon fluoride, krypton halides, such as krypton fluoride, or any other compounds including a noble gas element and a halogen that may be used or useful in semiconductor processes. Similar to method 400 , method 700 may utilize xenon difluoride as one of the halogen-containing precursors, which
- the interhalogen precursors may include one or more fluorides containing fluorine and one or more of chlorine, bromine, or iodine, one or more chlorides containing chlorine and one or more of fluorine, bromine, or iodine, one or more bromides containing bromine or one or more of fluorine, chlorine, or iodine, or other interhalogen precursors that may be used or useful in semiconductor processes.
- Some exemplary interhalogen precursors may include iodine fluoride, such as iodine monofluoride, iodine trifluoride, iodine pentafluoride, iodine heptafluoride, and may further include chlorine fluoride, such as chlorine monofluoride, chlorine trifluoride, chlorine pentafluoride, and so on.
- the fluorinating precursors may include any of the noble gas compound precursors or the interhalogen precursors described above.
- Method 700 may further include operation 710 similar to operation 410 , during which the halogen-containing precursors may contact the exposed regions of the processed structure, which may include exposed regions of select metal-containing materials, such as titanium, tantalum, tungsten, or one or more compounds thereof, such as titanium nitride, tantalum nitride, titanium tungsten, and so on. Method 700 may also forming a film on the surfaces of the exposed regions of the processed structure at operation 715 , which may be similar to operation 415 .
- select metal-containing materials such as titanium, tantalum, tungsten, or one or more compounds thereof, such as titanium nitride, tantalum nitride, titanium tungsten, and so on.
- Method 700 may also forming a film on the surfaces of the exposed regions of the processed structure at operation 715 , which may be similar to operation 415 .
- Method 700 may also include pausing the flow of the halogen-containing precursors at operation 720 by halting the flow of the halogen-containing precursors, and may further include purging the halogen-containing precursors that may not be adsorbed on the exposed surfaces of the processed structure at operation 725 such that only the halogen-containing precursors that may be adsorbed at the exposed surfaces of the processed structure may remain in the processing region forming the halogen-containing precursor film, and any excess may be removed from the processing region. In some embodiments, only one or a few atomic or molecular layers of the halogen-containing precursors may be adsorbed on the exposed surfaces of the processed structure.
- method 700 may include additional controls over operational conditions and such to control the thickness of the halogen-containing precursor film. For example, at operation 705 , only a predetermined or calculated amount or dosage of the halogen-containing precursors may be flowed to the processing region. The flow rate of the halogen-containing precursors may be maintained at relatively low levels to facilitate uniform film formation.
- the flow rate of the halogen-containing precursors may be less than or about 50 sccm in embodiments, and may be less than or about 45 sccm, less than or about 40 sccm, less than or about 35 sccm, less than or about 30 sccm, less than or about 25 sccm, less than or about 20 sccm, less than or about 15 sccm, less than or about 10 sccm, less than or about 5 sccm, less than or about 3 sccm, less than or about 1 sccm, or less.
- the flow of the halogen-containing precursors may be pulsed for time periods of less than or about 30 seconds in embodiments, and may be pulsed for time periods of less than or about 25 seconds, less than or about 20 seconds, less than or about 15 seconds, less than or about 10 seconds, less than or about 5 seconds, less than or about 2 seconds, or less.
- the flow or delivery of the halogen-containing precursors may be paused for less than or about 30 seconds in embodiments, and may be paused for time periods of less than or about 25 seconds, less than or about 20 seconds, less than or about 15 seconds, less than or about 10 seconds, less than or about 5 seconds, less than or about 2 seconds, or less.
- the flow rate and pulsing may be combined for any of the listed numbers.
- the flow rate of the halogen-containing precursors may be below or about 10 sccm and may be delivered in pulses from about 5 to about 10 seconds in embodiments, depending on the desired thickness of the film formed.
- the pressure of the processing region of the processing chamber may be maintained at relatively low levels, similar to the pressure levels maintained during operations of method 400 .
- the pressure of the processing region may be maintained below or about 50 Torr in embodiments.
- the pressure may be maintained below or about 40 Torr, and may be maintained below or about 30 Torr, below or about 20 Torr, below or about 15 Torr, below or about 10 Torr, below or about 5 Torr, below or about 4 Torr, below or about 3 Torr, below or about 2 Torr, below or about 1 Torr, below or about 800 mTorr, below or about 600 mTorr, below or about 400 mTorr, below or about 200 mTorr, below or about 100 mTorr, below or about 80 mTorr, below or about 60 mTorr, below or about 40 mTorr, below or about 20 mTorr, below or about 10 mTorr, below or about 5 mTorr, below or about 2 mTorr, below
- the temperature in the processing region or at the substrate level may be maintained at an elevated level during method 700 as compared to that of method 400 so as to allow for selective etching of titanium, tantalum, tungsten, or one or more compounds thereof, such as titanium nitride, tantalum nitride, titanium tungsten, and so on.
- the temperature of the processing region or at the substrate level may be maintained between about 0° C. and about 400° C. in embodiments.
- the temperature may be maintained above or about 5° C., and may be maintained above or about 10° C., above or about 15° C., above or about 20° C., above or about 25° C., above or about 30° C., above or about 50° C., above or about 75° C., above or about 100° C., above or about 150° C., above or about 200° C., above or about 250° C., above or about 300° C., above or about 350° C., or higher. Maintaining the temperature of the processing region or the substrate at relatively high temperature may increase the etch rate of titanium, tantalum, tungsten, or one or more compounds thereof, such as titanium nitride, tantalum nitride, titanium tungsten.
- relatively high operational temperature may also decrease the selectivity of the halogen-containing precursors towards these materials.
- the temperature of the processing region may be maintained between about room temperature and about 300° C. to achieve desired etch rate as well as desired selectivity.
- method 700 may then proceed to operation 730 to etch select materials at the exposed regions of the processed structure.
- the interaction between the adsorbed halogen-containing precursors with titanium, tantalum, tungsten, titanium nitride, tantalum nitride, or titanium tungsten may produce one or more volatile substances, which may then be removed from the processing chamber.
- the volatile byproducts produced may include halides of titanium, tantalum, or tungsten, such as fluorides of titanium, tantalum, or tungsten.
- the volatile byproducts produced may further include a noble gas or a halogen, which may be captured and recycled to produce additional halogen-containing precursors, as described below.
- an etched thickness of less than or about 5 nm may be achieved.
- the removal may be at least about 5 ⁇ , and may be between about 5 ⁇ and about 5 nm of removal, or between about 10 ⁇ and about 2 nm of removal.
- method 700 may be repeated for several cycles to achieve a greater overall removal thickness.
- method 700 may be repeated for at least two cycles, and may be repeated for at least about 3 cycles, at least about 5 cycles, at least about 8 cycles, at least about 10 cycles, at least about 20 cycles, at least about 50 cycles, at least about 100 cycles, or more. The number of cycles may be dependent on the amount of removal provided by each cycle.
- Method 700 may have a selectivity towards titanium, tantalum, tungsten, titanium nitride, tantalum nitride, or titanium tungsten over silicon nitride, silicon carbide, silicon oxide, thermal oxide, or low temperature oxide of greater than or about 50:1, greater than or about 100:1, greater than or about 150:1, greater than or about 200:1, or higher depending on the operating conditions. Method 700 may also have a similar selectivity towards titanium, tantalum, tungsten, titanium nitride, tantalum nitride, or titanium tungsten over gold or copper.
- Other materials commonly used in semiconductor processing that method 700 may not etch, or may have a close to infinite selectivity over, even at elevated temperatures may include aluminum, nickel, chrome, platinum, gallium, hafnium, aluminum nitride, gallium arsenide, select oxides, such as PZT, magnesium oxide, zinc oxide, hafnium oxide, titanium oxide, aluminum oxide, zirconium dioxide, and so on.
- Method 700 may further have high selectivity over select polymers or organic compounds commonly used in semiconductor processing, such as photoresists, PDMS (polydimethylsiloxane), C 4 F 8 , silica glass, dicing tape, PP (polypropylene), PEN (polyethylene naphthalate), PET (polyethylene terephthalate), ETFE (ethylene tetrafluoroethylene), acrylic, and so on.
- PDMS polydimethylsiloxane
- C 4 F 8 silica glass
- dicing tape PP (polypropylene), PEN (polyethylene naphthalate), PET (polyethylene terephthalate), ETFE (ethylene tetrafluoroethylene), acrylic, and so on.
- PDMS polydimethylsiloxane
- C 4 F 8 silica glass
- dicing tape PP (polypropylene)
- PEN polyethylene naphthalate
- PET polyethylene terephthalate
- method 700 may also be performed to etch or remove the semiconductor materials that method 400 may be performed to etch or remove. Given the elevated temperature, method 700 may yield greater etch rates as compared to method 400 . However, method 400 may yield improved selectivity. Depending on the particular application, if the structure to be processed containing exposed regions of materials may be etched by both method 400 and method 700 , then method 700 may be performed.
- the materials to be removed include one of the metal-containing materials etched by method 700 , such as titanium, titanium nitride, tantalum, tantalum nitride, tungsten, or titanium tungsten
- method 700 may be performed to remove the semiconductor materials as well as the metal-containing materials.
- the semiconductor materials or the metal-containing materials may be removed at different operations, then the temperature in the processing region or at the substrate level may be adjusted accordingly to achieve desired removal using either method 400 or method 700 .
- the substrate may be processed at different processing chambers maintained at different temperatures, with one at room temperature for method 400 and one at elevated temperature for method 700 .
- Method 800 may include operations 805 - 830 similar to or the same as operations 405 - 430 of method 400 or operations 705 - 730 of method 700 , depending on the particular materials to be removed.
- operations 805 - 830 may be similar to operations 405 - 430 for etching semiconductor materials.
- operations 805 - 830 may be similar to operations 705 - 730 for etching select metal-containing materials and/or semiconductor materials.
- Method 800 may include, at operation 805 , flowing a first halogen-containing precursor into a processing region of a processing chamber where a processed structure may be positioned.
- the first halogen-containing precursor may include one or more of any of the halogen-containing precursors described above with reference to method 400 and method 700 .
- the first halogen-containing precursor flowed at operation 805 may include one or more of noble gas compound precursors, interhalogen precursors, fluorinating precursors, or other halogen-containing precursors.
- the noble gas compound precursors may include one or more noble gas halide, which may include xenon halides, such as xenon fluoride, krypton halides, such as krypton fluoride, or any other compounds including a noble gas element and a halogen that may be used or useful in semiconductor processes. Similar to method 400 and method 700 , method 800 may utilize xenon difluoride as the first halogen-containing precursor.
- the interhalogen precursors may include one or more fluorides containing fluorine and one or more of chlorine, bromine, or iodine, one or more chlorides containing chlorine and one or more of fluorine, bromine, or iodine, one or more bromides containing bromine or one or more of fluorine, chlorine, or iodine, or other interhalogen precursors that may be used or useful in semiconductor processes.
- Some exemplary interhalogen precursors may include iodine fluoride, such as iodine monofluoride, iodine trifluoride, iodine pentafluoride, iodine heptafluoride, and may further include chlorine fluoride, such as chlorine monofluoride, chlorine trifluoride, chlorine pentafluoride, and so on.
- the fluorinating precursors may include any of the noble gas compound precursors or the interhalogen precursors described above.
- Method 800 may further include operation 810 , during which the first halogen-containing precursor may contact the exposed regions of the processed structure, and may form a film on the exposed surfaces of the processed structure at operation 815 .
- Method 800 may also include pausing the flow of the first halogen-containing precursor at operation 820 by halting the flow of the first halogen-containing precursor, and may further include purging the first halogen-containing precursor that may not be adsorbed on the exposed surfaces of the processed structure at operation 825 such that only the first halogen-containing precursor that may be adsorbed at the exposed surfaces of the processed structure may remain in the processing region forming the first halogen-containing precursor film, and any excess may be removed from the processing region.
- method 800 may further implement controls over the flow rate of the first halogen-containing precursor, the temperature and/or pressure of the loading chamber of the first halogen-containing precursor (if utilized), the temperature and/or pressure of the processing region of the chamber where the processed structure may be positioned, and/or other operational parameters, to obtain a desired thickness of the film of the first halogen-containing precursor, which may be one or a few atomic or molecular layers of the first halogen-containing precursor in some embodiments.
- method 800 may then proceed to operation 830 to etch select materials at the exposed regions of the processed structure, which may produce one or more volatile etch byproducts.
- etch byproducts may be collected and recycled to generate halogen-containing precursors.
- a noble gas compound precursor may be used during operations 805 - 830 , then one of the volatile byproducts generated may include a noble gas, which may be collected at operation 835 .
- xenon difluoride may be used as the first halogen-containing precursor during operation 805 - 830
- xenon gas may be produced at operation 830 and may be collected at operation 835 .
- an interhalogen precursor may be used during operations 805 - 830 , then one of the volatile byproducts generated may include a gas of one of the halogen elements forming the interhalogen, such as the element having a relatively lower electronegativity compared to the other element forming the interhalogen.
- the gas of the halogen element having the relatively low electronegativity may also be collected at operation 835 .
- chlorine fluoride may be used at the first halogen-containing precursor during operation 805 - 830
- chlorine gas may be produced at operation 830 and may be collected at operation 835 .
- the noble gas and/or the halogen gas collected at operation 835 may be delivered into a processing chamber or system at operation 840 to mix with a halogen-containing plasma, such as fluorine-containing plasma, which may include a plasma formed from nitrogen trifluoride.
- a halogen-containing plasma such as fluorine-containing plasma, which may include a plasma formed from nitrogen trifluoride.
- a second halogen-containing precursor may be formed through the reaction between the collected gas and the halogen-containing precursor.
- the second halogen-containing precursor may then be flowed back to the processing region for etching exposed regions of the processed structure, similar to how the first halogen-containing precursor may be flowed to the processing region for etching the exposed regions of the processed structure in operations 805 - 830 .
- the second halogen-containing precursor may be flowed back to the same processing region for continued etching of the processed structure. In some embodiments, the second halogen-containing precursor may be flowed to a different processing chamber for etching a different processed structure. In some embodiments, the second halogen-containing precursor generated may be preserved for later use.
- the xenon difluoride generated at step 845 may be collected by increasing the chamber pressure and/or lowering the chamber temperature such that xenon difluoride solid may be formed and collected.
- the processing chamber for generating the second halogen-containing precursor may be the same as the processing chamber in which operations 805 - 830 may be performed.
- the processing chamber may include a remote plasma region, such as the capacitively-coupled plasma (CCP) region 215 described above with reference to FIG. 2 , which may be fluidly connected with but separate from the processing region where the processed structure may be positioned.
- CCP capacitively-coupled plasma
- the plasma powers utilized may be relative low so as to prevent damage to structures on the processed structure.
- the plasma power in the CCP region may be at least about 50 W, and may be greater than or about 100 W, greater than or about 150 W, greater than or about 200 W, greater than or about 250 W, greater than or about 300 W, greater than or about 350 W, greater than or about 400 W, greater than or about 450 W, greater than or about 500 W, or more in embodiments.
- the processing chamber for generating the second halogen-containing precursor using plasma may be a different chamber separated from but fluidly connected with the processing chamber in which operations 805 - 830 may be performed.
- the second halogen-containing precursor may be generated using a remote plasma system, such as the RPS 201 discussed above with reference to FIG. 2 .
- the plasma power utilized by the separate chamber or system may be at least about 500 W, and may be greater than or about 1000 W, greater than or about 1500 W, greater than or about 2000 W, greater than or about 2500 W, greater than or about 3000 W, greater than or about 3500 W, greater than or about 4000 W, or more, to facilitate the dissociation of the fluorine-containing precursors.
- Generating the second halogen-containing precursor using a separate chamber or system may limit or prevent any plasma that may be flowed into the processing region, which may damage the substrate features and cause unevenness in the etched profile. It may also allow for more precise control of the halogen-containing precursor flowed towards the processed structure so as to achieve thin layer etching, such as atomic or molecular layer etching. In addition, because plasma may be used in forming the second halogen-containing precursor, the temperature of the second halogen-containing precursor formed may be relatively high. Forming the second halogen-containing precursor in a separate chamber or system may also allow the second halogen-containing precursor to be cooled to a desired temperature before being flowed to the processing region at operation 850 .
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